Disymmetry

Disymmetry , or also biradial symmetry , two- ray symmetrical, in flora and fauna denotes the division into pairs of mirror-image halves in the case of a main and a minor axis . The lower plane of symmetry is offset by 90 degrees compared to the upper one. In Botany icon Disymmetrie is an expanded cross: . The bilateral symmetry, on the other hand, has only one plane of symmetry (monosymmetrical) and is called a zygomorph . The disymmetry, like the radial symmetry in flowers, is one of the actinomorphic forms because there are two or more planes of symmetry.

It occurs, among other things, in comb jellyfish and the flowers of fumed plants , heart flowers and cruciferous vegetables .

See also

• Radial symmetry

literature

• Yoland Savriama & Christian Peter Klingenberg: Beyond bilateral symmetry: geometric morphometric methods for any type of symmetry. In: BMC Evolutionary Biology. 11, 2011, p. 280, doi : 10.1186 / 1471-2148-11-280 . (open access)

Web links

• Lexicon of biology: disymmetry

Individual evidence

1. ^ Theodor Rümpler : Illustrated gardening lexicon. 3rd edition, Parey, 1902, p. 805.